| 摘要 |
PROBLEM TO BE SOLVED: To provide a sip client and the like for enabling all users to utilize a SIP based on the up-to-date specification, by solving a problem related to interconnectivity.SOLUTION: A SIP client comprises: a base function execution unit 100 for performing basic action specified previously; and a temporary application action unit 200 for performing communication with another SIP client by activating a temporary application downloaded from a temporary application server, where the base function execution unit comprises: a request capture function 104 for capturing the fact that the temporary application action unit has started communication action by using a temporary application of a previous version; an action state storage function 107 for temporarily storing a state of the temporary application in action in storage means provided in advance; and a temporary application update function 102 for making the action state continue by making the temporary application action unit activate a downloaded temporary application of the up-to-date version. |
